Posterior canal-activated excitatory vestibuloocular relay neurons participate in the vestibulocortical pathways in cats
| Autor: | Hisaaki Ikoma, Hiromi Matsui, Masae Hosogai, Satoshi Matsuo |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Thalamus
Biology Vestibular Nerve Ventrobasal complex Oculomotor nucleus Oculomotor Nerve Orientation Neural Pathways medicine Reaction Time Animals Axon Oval Window Ear Dominance Cerebral Evoked Potentials Muscle Spindles Postural Balance Vestibular system Cerebral Cortex Neurons Brain Mapping Cerebral Aqueduct Geniculate Bodies General Medicine Anatomy Reflex Vestibulo-Ocular Medial geniculate body Electric Stimulation medicine.anatomical_structure nervous system Otorhinolaryngology Round Window Ear Ear Inner Thalamic Nuclei Excitatory postsynaptic potential Cats Joints Neuron |
| Zdroj: | Acta oto-laryngologica. Supplementum. |
| ISSN: | 0365-5237 |
| Popis: | We have previously reported that axon collaterals of posterior canal-activated excitatory vestibular (PC) neurons project to the contralateral oculomotor nucleus, and rostrally to the thalamus. To elucidate the vestibulothalamocortical pathways we investigated the synaptic connections of the PC neurons with the thalamic neurons by post-spike averaging of compound potentials triggered by spikes of the PC neuron in anesthetized cats. The averaged field potential evoked in the ventrobasal complex (VBC) revealed a spike followed by a negative wave. Latencies of the wave ranged from 0.8 to 1.5 ms. Next, we examined the location and axonal projection of 36 thalamic neurons which were activated by nose-up head rotation and by contralateral labyrinth stimulation. Most of them were located in the VBC and some in the medial geniculate body. Thirteen of the 36 neurons were antidromically activated from the anterior suprasylvian sulcus or postcruciate dimple of the cortex. These results suggest that the PC neurons participate, at least in part, in the vestibulocortical pathways contributing to spatial orientation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|